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Click on image for the lowdown. 
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| | | Forums66 Topics128,023 Posts1,055,367 Members48,420 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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#21775 10/21/2003 1:24 PM | Joined: May 2003 Posts: 111 Member | | Member Joined: May 2003 Posts: 111 | Thanks. I tried looking up in my books (chiltons and clymers) but no diagrams for vacuum. BTW: both operate the advance, I just wanted to know which was better for it. Even if I feel dumb asking it, I know some else has the same question. Thanks again to the responders.
35 + years of rollin' steel!
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